Back to EveryPatent.com
United States Patent | 6,105,159 |
Frederickson | August 15, 2000 |
A digital communication apparatus (20) transmits sectors of digital values that include error correction values used to detect and correct errors within the sector. Each sector consists of a number of blocks (70, 72, 74) and the error correction values of each block (70) are useful in correcting up to a maximum number of erroneous digital units (78, 84) in that block (70). The digital communication apparatus (20) encodes the blocks of digital units to transmit them through a channel (32) and then decodes the channel's representation of those encoded blocks, where the channel's representation occasionally contains burst errors. The encoding and decoding is performed in a manner that reduces the number of consecutive erroneous digital units caused by any one burst error to a number less than the number of
Inventors: | Frederickson; Lisa (Ojai, CA) |
Assignee: | Seagate Technology, Inc. (Scotts Valley, CA) |
Appl. No.: | 973444 |
Filed: | December 5, 1997 |
PCT Filed: | June 7, 1996 |
PCT NO: | PCT/US96/09506 |
371 Date: | December 5, 1997 |
102(e) Date: | December 5, 1997 |
PCT PUB.NO.: | WO96/41341 |
PCT PUB. Date: | December 19, 1996 |
Current U.S. Class: | 714/762; 714/769; 714/792 |
Intern'l Class: | H03M 013/05; H03M 013/27; G11V 020/18 |
Field of Search: | 714/757,758,761,762,769,792 |
4751590 | Jun., 1988 | Wilkinson | 360/19. |
5050171 | Sep., 1991 | Ishijima | 371/47. |
5109385 | Apr., 1992 | Karp et al. | 371/42. |
5220568 | Jun., 1993 | Howe et al. | 371/37. |
5263030 | Nov., 1993 | Rotker et al. | 371/39. |
5329535 | Jul., 1994 | Coker | 371/39. |
5373513 | Dec., 1994 | Howe et al. | 371/42. |
5422760 | Jun., 1995 | Abbott et al. | 360/46. |
5422895 | Jun., 1995 | Nguyen et al. | 371/37. |
5544178 | Aug., 1996 | Kook | 371/43. |
5602857 | Feb., 1997 | Zook et al. | 371/40. |
5691993 | Nov., 1997 | Fredrickson | 371/38. |
Foreign Patent Documents | |||
0322078 | Jun., 1989 | EP. | |
0364229 | Apr., 1990 | EP. |
Thapar et al., "On the Performance of a Rate 8/10 Matched Spectral Null Code for Class-4 Partial Response", IEEE Transactions on Magnetics, vol. 28, No. 5, Sep. 1992, pp. 2883-2888. Fredrickson et al., "Improved Trellis-Coding for Partial-Response Channels", IEEE Transactions on Magnetics, vol. 31, No. 2, Mar. 1995, pp. 1141-1148. Rae et al., "Design and Performance of a VLSI 120 Mb/s Trellis-Coded Partial Response Channel", IEEE Transactions on Magnetics, vol. 31, No. 2, Mar. 1995, pp. 1208-1214. Cideciyan et al., "Codes Preventing Quasi-Catastrophic Error Propagation in Partial-Response Systems", IEEE Transactions on Information Theory, vol. 41, No. 2, Mar. 1995, pp. 600-604. |
______________________________________ SINGLE BIT PATH BRANCH METRIC ______________________________________ shaded-to-shaded b.sub.0 = 0 white-to-white b.sub.0 = 0 shaded-to-white b.sub.-1 = .5 + y white-to-shaded b.sub.1 = .5 - y ______________________________________